JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package jdk.jfr.internal.settings;

import java.util.Objects;
import java.util.Set;

import jdk.jfr.Description;
import jdk.jfr.Label;
import jdk.jfr.MetadataDefinition;
import jdk.jfr.Name;
import jdk.jfr.Timespan;
import jdk.jfr.internal.PlatformEventType;
import jdk.jfr.internal.Control;
import jdk.jfr.internal.Type;
import jdk.jfr.internal.Utils;
@MetadataDefinition
@Label("Threshold")
@Name(Type.SETTINGS_PREFIX + "Threshold")
@Description("Record event with duration above or equal to threshold")
@Timespan
public final class ThresholdSetting extends Control {
    private final static long typeId = Type.getTypeId(ThresholdSetting.class);
    private String value = "0 ns";
    private final PlatformEventType eventType;

    public ThresholdSetting(PlatformEventType eventType, String defaultValue) {
       super(defaultValue);
       this.eventType = Objects.requireNonNull(eventType);
    }

    @Override
    public String combine(Set<String> values) {
        Long min = null;
        String text = null;
        for (String value : values) {
            long l = Utils.parseTimespanWithInfinity(value);
            // always accept first value
            if (min == null) {
                min = l;
                text = value;
            } else {
                if (l < min) {
                    text = value;
                    min = l;
                }
            }
        }
        return text == null ? "0 ns" : text;
    }

    @Override
    public void setValue(String value) {

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